107 lines
4.4 KiB
Groff
107 lines
4.4 KiB
Groff
.\" $NetBSD: guspnp.4,v 1.2 1997/10/08 21:59:57 jtc Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" Author: Kari Mettinen
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd Oct 5, 1997
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.Dt guspnp 4 "Am78C201 device driver" "Version 1.0"
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.Sh NAME
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guspnp \- Am78C201 device driver
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.Sh SYNOPSIS
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.Cd "guspnp* at isapnp?"
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.Cd "audio* at guspnp?"
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.Pp
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There should be no limit caused by the driver on the number of drivers
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or cards active in the system.
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.Sh DESCRIPTION
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The
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.Nm guspnp
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driver provides support for audiosubsystems using the Interwave (Am78C20x)
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family of ICs, usually the Gravis Ultrasound Plug and Play. Unlike the
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.Nm gus
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driver guspnp driver does not require any local memory for the IC, but uses
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the codec for both playback and recording. The
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.Nm guspnp
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driver can simultaneously playback and record 8- and 16-bit samples at
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frequencies from 5.51kHz to 48kHz.
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.Pp
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The
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.Nm guspnp
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driver relies on
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.Nm isapnp
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to allocate suitable resources for it. This version of the driver only
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uses the first logical device of 5 the interwave IC has. The 4 Unused
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logical devices are ATAPI CD-ROM device, PnP Joystick device, Legacy
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soundcard emulation device (Soundblaster) and MIDI serial device. Support
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for atleast ATAPI CD-ROM and Joystick is being worked on.
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This version of the driver will use 1 IRQ and 2 DRQs.
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.Sh BUGS
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Sometimes you can cause a hiss on either left or right channel, or both.
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You can usually make it disappear by playing random data, however this
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might not be a very nice thing to your audio equipment, but it is the only
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way I have found out to be effective.
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.Pp
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Only the Codec is used in this version of the driver, therefore only 2
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channels are supported (left and right). Also sound quality is propably
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worse at lower kHz compared to playing through the synthesizer which does
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interpolation.
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.Pp
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If the implementation has a 'bad' oscillator, using frequencies 44.8kHz
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and 38.4kHz will result in incorrect playback frequency. The author has
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a GUS PnP Pro which displays this behaviour.
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.Pp
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Other members of the Interwave family have not been tested and don't
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have the glue needed to make them work. Should someone need to implement it,
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not many changes in the existing code are needed. Output voltage control in
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register CFIG2 [7] should be set differently for some other members of the
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family.
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.Pp
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Other architectures than i386 haven't been tested. The bus_space abstraction
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has been used from the beginning, so it should work.
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.Sh SEE ALSO
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.Xr audio 4 ,
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.Xr isapnp 4 ,
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.Xr gus 4
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.Sh AUTHOR
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Kari Mettinen (Kari.Mettinen@helsinki.fi), University of Helsinki.
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.Sh REFERENCES
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Interwave(tm) IC Am78C201/202 Programmer's Guide Rev. 2. 1996. Advanced
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Micro Devices.
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.Sh HISTORY
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The
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.Nm guspnp
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driver appeared in
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.Nx 1.3 .
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